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Fail-safe automation system
Fail-safe automation system (F systems) are used in plants requiring higher levels of safety.
F systems control production processes in such a way that residual error probability is taken
into consideration to achieve a safe operating state when a shutdown occurs. An immediate
shutdown therefore does not pose a danger to people or the environment.
Operating KP8F in a fail-safe manner
The KP8F device is a PROFINET IO device on Industrial Ethernet.
In fail-safe mode the HMI device registers the signal states of compatible emergency stop
buttons and transmits corresponding safety frames to the controller. The controller and the
HMI device communicate with each other using the fail-safe protocol, PROFIsafe.
The HMI device can operate in fail-safe mode corresponding to SIL3, Performance Level e
and category 4 if the safety functions are appropriately configured in STEP 7 with the "S7
Distributed Safety" add-on package.
Fail-safe mode of the HMI devices differs from standard mode essentially in that during
communication, the signals are checked for being error-free (error-safe). In the event of a
fault, the HMI device is placed in a safe state.
The fail-safe connection fulfills the following requirements:
● Single-channel mode with 1oo1 parameterization
– Safety category SIL2 corresponding to IEC 61508:2010
– Safety category Performance Level d corresponding to IEC 13849:2006
– Safety category category 3 corresponding to EN 954:1996
● Two-channel mode with 1oo2 parameterization
– Safety category SIL3 corresponding to IEC 61508:2010
– Safety category Performance Level e corresponding to IEC 13849:2006
– Safety category category 4 corresponding to EN 954:1996
The HMI device can be operated simultaneously in standard mode and fail-safe mode.
Diagnostics function of KP8F
The fail-safe KP8F includes non-configurable diagnostic functions. The diagnostics functions
are always active. The diagnostics result is automatically made available by the HMI device
in STEP 7 and passed on to the fail-safe controller in the event of a fault.
KP8, KP8F
Operating Instructions, 10/2010, A5E03284305-01
1.8 Operating KP8F in a fail-safe manner
Overview
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